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CHICAGO — Democratic candidate for governor J.B. Pritzker has selected state Rep. Juliana Stratton of Chicago to be his running mate in the 2018 election.

The announcement was made at Sherwood Park on Chicago’s South Side, in the district Stratton represents in the state legislature.

The billionaire businessman from Chicago said Thursday that Stratton has "taken on" Republican Gov. Bruce Rauner and will fight for working and middle-class families statewide as his lieutenant governor.

Stratton won her first term in office last year with the help of an endorsement from President Barack Obama. She defeated Rep. Ken Dunkin in a Democratic primary that was seen as a proxy war between Rauner and Democratic House Speaker Michael Madigan.